Two-tone Chao can have odd colorations, but the way they are bred is extremely simple. You simply have to breed a normal, default Chao with a single-colored Chao! It's less simple to predict how a two-tone Chao will look and evolve, though…

White two-tone

Breeding a normal Chao and a white Chao can result in this. A white two-tone Chao, freshly hatched, will look like a normal Chao with a slightly paler shade of yellow highlights. If you are breeding for a white two-tone, know that petting the Chao with dark characters reveal the white highlights.

First evolution

Neutral None

The Chao's yellow highlights become white.

Neutral Power

The Chao gains an orange body tone, a red belly, white stripes and tips on its head points, orange and white hand tips, and white stripes and tips on its feet.

Blue two-tone

Breeding a normal Chao and a blue Chao can result in this. A blue two-tone Chao, freshly hatched, will have a royal blue body color and navy blue highlights on its head point, hands, feet and stomach. The highlights might be difficult to see at first, to pet your Chao with a hero character to lighten the body color and make sure it's not a plain blue Chao!

First evolution

Hero Swim

The Chao's royal blue body tone lightens a little, and its dark blue highlights gain an additional midnight blue gradient on its upper chest, head piece tips and wrists.

Green goo two-tone

A special breed of two-tone! Breeding a shiny white Chao and any jewel Chao can result in this. A green goo two-tone Chao, freshly hatched, will look clear, shiny, and see-through, with see-through green highlights, but have solid, pink wings. Petting this Chao with hero characters will turn it to a paler, foggy translucence, and petting it with dark characters will turn it to a darker, shadowy translucence.

First evolution

Hero Swim

The Chao's body color will be a foggy, translucent white, and it will have turquoise highlights on its chest, head pieces, and soles of its feet and aquamarine highlights around the whitish belly area, the tips of its head pieces, and around its wrists and over its toes.

Second evolution

Hero Swim/Swim

The Chao's body color will be a foggy, translucent white, and it will have bluish-mauve highlights on its chest and head piece tips, with turquoise highlights around the whitish belly area, most of its head pieces, and around its wrists and over its toes and soles.